Reliability of the classification of proximal femur fractures: Does clinical experience matter?

BACKGROUND

Radiographic fracture classification helps with research on prognosis and treatment. AO/OTA classification into fracture type has shown to be reliable, but further classification of fractures into subgroups reduces the interobserver agreement and takes a considerable amount of practice and experience in order to master.

QUESTIONS/PURPOSES

We assessed: (1) differences between more and less experienced trauma surgeons based on hip fractures treated per year, years of experience, and the percentage of their time dedicated to trauma, (2) differences in the interobserver agreement between classification into fracture type, group, and subgroup, and (3) differences in the interobserver agreement when assessing fracture stability compared to classifying fractures into type, group and subgroup.

METHODS

This study used the Science of Variation Group to measure factors associated with variation in interobserver agreement on classification of proximal femur fractures according to the AO/OTA classification on radiographs. We selected 30 anteroposterior radiographs from 1061 patients aged 55 years or older with an isolated fracture of the proximal femur, with a spectrum of fracture types proportional to the full database. To measure the interobserver agreement the Fleiss' kappa was determined and bootstrapping (resamples = 1000) was used to calculate the standard error, z statistic, and 95% confidence intervals. We compared the Kappa values of surgeons with more experience to less experienced surgeons.

RESULTS

There were no statistically significant differences in the Kappa values on each classification level (type, group, subgroup) between more and less experienced surgeons. When all surgeons were combined into one group, the interobserver reliability was the greatest for classifying the fractures into type (kappa, 0.90; 95% CI, 0.83 to 0.97; p < 0.001), reflecting almost perfect agreement. When comparing the kappa values between classes (type, group, subgroup), we found statistically significant differences between each class. Substantial agreement was found in the clinically relevant groups stable/unstable trochanteric, displaced/non-displaced femoral neck, and femoral head fractures (kappa, 0.60; 95% CI, 0.53 to 0.67, p < 0.001).

CONCLUSIONS

This study adds to a growing body of evidence that relatively simple distinctions are more reliable and that this is independent of surgeon experience.

Interpretation of Post-operative Distal Humerus Radiographs After Internal Fixation: Prediction of Later Loss of Fixation

PURPOSE

Stable fixation of distal humerus fracture fragments is necessary for adequate healing and maintenance of reduction. The purpose of this study was to measure the reliability and accuracy of interpretation of postoperative radiographs to predict which implants will loosen or break after operative treatment of bicolumnar distal humerus fractures. We also addressed agreement among surgeons regarding which fracture fixation will loosen or break and the influence of years in independent practice, location of practice, and so forth.

METHODS

A total of 232 orthopedic residents and surgeons from around the world evaluated 24 anteroposterior and lateral radiographs of distal humerus fractures on a Web-based platform to predict which implants would loosen or break. Agreement among observers was measured using the multi-rater kappa measure.

RESULTS

The sensitivity of prediction of failure of fixation of distal humerus fracture on radiographs was 63%, specificity was 53%, positive predictive value was 36%, the negative predictive value was 78%, and accuracy was 56%. There was fair interobserver agreement (κ = 0.27) regarding predictions of failure of fixation of distal humerus fracture on radiographs. Interobserver variability did not change when assessed for the various subgroups.

CONCLUSIONS

When experienced and skilled surgeons perform fixation of type C distal humerus fracture, the immediate postoperative radiograph is not predictive of fixation failure. Reoperation based on the probability of failure might not be advisable.

TYPE OF STUDY/LEVEL OF EVIDENCE

Diagnostic III.

[Subtotal spinal cord dissection from a stab injury]

We report a stab-injury of the back with consecutive dissection of a thoracic vertebral arch and subtotal dissection of the spinal cord. The clinical findings and out-come of the patient--representing an incomplete Brown-Sequardsyndrome--are described. The diagnostic and therapeutic management of such rare entities is discussed.

[Treatment of fingertip defect injuries with a semi-occlusive dressing]

In the treatment of substance loss of fingertips it is crucial to maintain functional length and to restore adequate sensibility. By treating those injuries with a semiocclusive dressing according to Mennen and Wiese (1993), we were able to achieve both goals with excellent results, avoiding the necessity of local or regional flaps as well as shortening of bone to achieve primary closure. 82 patients with 85 injured digits were treated either conventionally (primary closure with or without shortening of bone, vaseline gauze dressings: 31 digits) or with semiocclusive dressings (54 digits). 42 digits of the latter group with complete protocols were evaluated at the end of treatment. 26 digits with defects of skin and subcutaneous tissue of less than 1 cm2 to more than 2 cm2 necessitated an average of 18 days until complete healing (minimum 6, maximum 46 days). Eight digits with loss of skin, subcutaneous tissues and nailbed healed within 10 to 32 days (average 22 days) and eight digits in which defects included bone loss averaged 49 days for complete healing (37 to 64 days). No complications, especially no infections have been observed. All healed finger-tips were well padded, painless, many without visible scar and with static two-point discrimination between 2 and 8 mm.

Interphalangeal dislocation of the fourth toe with avulsion-fracture in a child: report of a case

Phalangeal dislocations of toes are extremely rare in childhood and usually can be treated by closed reduction. We present a proximal interphalangeal dislocation of the fourth toe with an irreducible avulsion fracture of the middle phalanx requiring open reduction. To our knowledge concomitant avulsion fractures in this condition have not been reported thus far in pediatric patients. The pathological mechanism of this injury is discussed, and the significance of the plantar plate for joint stability is emphasized.

[Surgical stabilization of thoracic wall fractures]

We report our experience with 12 patients whose chest wall injuries were treated with stable internal fixation by means of rib plates. Of all patients with chest wall injuries requiring inpatient treatment, only 5.19% were operated for this diagnosis; that is to say this operation is seldom indicated. In 5 patients stabilization was done "on the retreat" when thoracotomy had to be performed for intrathoracic injury anyway; in another 5 patients inadequate recovery from respiratory insufficiency following conservative treatment led to the operation, and in 2 patients extreme dislocation of chest wall fractures with restricted chest volume was the reason for surgical intervention. The mean age of these patients was 58 years, the mean PTS score 28.5 (ranging from 18 to 56), mean duration of postoperative mechanical ventilation 6 days (median 5 days), mean duration of stay in the intensive care unit 18 days, and duration of stay in hospital was 42 days, reflecting the severity of associated trauma. The stability achieved in the chest wall permitted sufficiently painfree spontaneous ventilation 1-5 days after the operation in 50% of patients. Two aged patients died of non-trauma-related myocardial infarction and myocardial insufficiency, respectively, while in hospital. Complications attributable to the specific surgical intervention were superficial infection of the incision (2 cases) and postoperative haemorrhage from an intercostal artery (1 case). No late complications related to the specific operative procedure occurred.(ABSTRACT TRUNCATED AT 250 WORDS)

[Neurogenic appendicopathy--long-term results following appendectomy]

The neurogenic appendicopathy is a disease which is caused by proliferation of nerve fibres and hyperplasia of endocrine cells in the submucosa of the appendix. It is to be diagnosed surely only histologically. 28 patients in which appendectomy specimens solely changes of neurogenic appendicopathy type were present have been traced. Following statements can be made: 1. The disease is curable in 96% by simple appendectomy. 2. Concerning this diagnosis about 60% of so-called "negative" appendectomies will find a reasonable explication. 3. At the same time a facultative precurser disease of appendiceal carcinoid tumor is removed.

[Medium term results of treatment of post-traumatic osteitis and osteomyelitis with gentamycin-PMMA minichains]

In 10 cases of posttraumatic osteitis or osteomyelitis gentamicin-PMMA minichains have been used for treatment after radical local debridement. In 8 cases infection could be controlled completely by this regimen, one case needed adjuvant systemic antibiotic treatment and only one case with proved primarily gentamicin-resistant beta-haemolytic-streptococcus could be controlled after removal of PMMA-minichain by systemic antibiotic treatment. 3 to 9 months after therapy all infections were still under control.